gchandle
Differences
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| gchandle [2018/09/07 04:23] – wolfgangriedmann | gchandle [2018/09/07 04:23] (current) – wolfgangriedmann | ||
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| Basically, you can get a handle from an object and lock it in memory so the garbage collector will not move it around: <code visualfoxpro> | Basically, you can get a handle from an object and lock it in memory so the garbage collector will not move it around: <code visualfoxpro> | ||
| - | oHandle := GCHandle.Alloc( oMyObject )< | + | oHandle := GCHandle.Alloc( oMyObject )</code> |
| and then get a pointer to it: <code visualfoxpro> | and then get a pointer to it: <code visualfoxpro> | ||
| - | ptrObject := GCHandle.ToIntPtr( oHandle )< | + | ptrObject := GCHandle.ToIntPtr( oHandle )</code> |
| To return then the object from the IntPtr (that is 32 bit wide in x86 mode, and 64 bit in x64 mode), you can use this code: <code visualfoxpro> | To return then the object from the IntPtr (that is 32 bit wide in x86 mode, and 64 bit in x64 mode), you can use this code: <code visualfoxpro> | ||
| local oObject as MyObject | local oObject as MyObject | ||
| oHandle := GCHandle.FromIntPtr( ptrObject ) | oHandle := GCHandle.FromIntPtr( ptrObject ) | ||
| - | oObject := (MyObject) GCHandle.Target< | + | oObject := (MyObject) GCHandle.Target< |
| And since you have locked this object in memory, it is very important to release it also with | And since you have locked this object in memory, it is very important to release it also with | ||
| <code visualfoxpro> | <code visualfoxpro> | ||
gchandle.txt · Last modified: 2018/09/07 04:23 by wolfgangriedmann